Holland



(No Model.)

B. GARLEY.

2 j SLIDE VALVE. No. 282,162. Patented July 31, 1883.

BENJAMIN GARLEY,

, UNITED STATES PATENT OF ICE.

SLIDE-VALVE.

srncrnrcarron forming part of Letters Patent to. 282,162, dated July 31,1883.

Application filed November 29, 1882. (No model.)

ToaZZ whom it 11mg concern:

Be it known that I, BENJAMIN OARLEY, of Paterson, in the county ofPassaic and State of New Jersey, have invented a new andusefulImprovement in Gut-Off Slide-Valves of f Engines, of which the followingis a specification.

Although my invention is. applicable to Steanrengines generally, it isespecially intended for locomotive-engines.

The invention relates to that class of engines in which is employedanouter slide-valve for controlling the passage of steam tothe inducstrokewhile working steam expansively.

The invention consists in a novel construc' tion and manner of combiningthe two valves so that the accidental movement of the inner. valveduring the first part of the movement of the outer valve will beprevented. The two valves may be connected by a rod passing through themboth and fitting loosely in holes in the inner valve, and the raising ofeither valve from its seat independently of the other valve will therebybe prevented.

In the accompanying drawings, Figure 1 represents a sectional view ofa'valve-seat and two slide-valves adapted to travel thereon andembodying my invention; and Fig. 2 represents a similar section, showingthe parts in a dif .ferent position.

Similar letters of reference designate corresponding parts in bothfigures.

A designates the valve-seat, wherein are the usual ports, B B, servingas induction and eduction ports for the cylinder, and the usual eductionor exhaust port, 0.

D designates the outer slide-valve, which controls the admission ofsteam or other motive agent through the ports'B B to the cylinder; and Edesignates the inner slide-Valve, which controls the exhaust of themotive agent from the ports B B to the port 0.

The outer valve, D, is or may be operated, in the usual way, by a yoke,D, surrounding the valve, whilethe inner valve, E, is operated by thesaid outer valve abutting against it.

At each end of the inner valve, E, is a proj ecting portion, the uppersurface, a, of which on PATEBSON, NEW JERSEY, ASSIGNOR TO CHARLESHOLLAND, on NEW YORK, N. Y.

is flat, andupon each end of the outer valve is a corresponding surface,a, which has a bearing on the surface a, and these bearing-surfacesserve to hold the inner valve to its seat.

The bearing-surfaces a a at each end of the valves form asteam-tightground joint, or may be provided with suitable packing to form asteam-tight joint and prevent steam from entering between the valves.

of the outer valve by the portions b striking the inner valve I mayprovide surfaces 0 on the inner valve, against which the said outervalve abuts, and, to avoid any violent concussion, springs may be placedbetween the inner and outer valves, so as to cushion the latter in itsmovements; or steam may be admitted between the ends of the inner valveand the end portions, b, of the outer valve for a like pur pose.

In Fig. 1 the valves are represented as in their movement towardtheright. The inner valve, E, now covers and entirely closes the ports B B5 but as the valves continue to move, the exhaust is opened from theport, B, and immediately thereafter the valve D opens the port B forlive steam. A

Fig. 2 represents the two valves in their extreme right-hand position,the exhaust-port O and the port B both being full open.

In moving toward the left the outer valve, D, moves alone until theright end portion b strikes the inner valve, E,;-and consequently theexhaust from the port B is free and unim peded until steam is cutofffrom the port B.

The steam-tightj oint formed between the sur- 60 5 The length of theoutervalve, D, between faces a a at each end of the valves is veryadvantageous, as can best be understood by reference to Fig. 2. As soonas the left-hand end portion 1) of the outer valve, D, passes onto theport B, so that steam can enter behind it, the end of the projectingportion of the inner valve will be acted upon by steam of full pressure,while the projecting portion at the opposite end of the valve will beacted upon by dead steam, which will be of slightly less pressure.Consequently the greater pressure is on the left-hand end of the innervalve, and prevents it from moving with the outer valve until it isacted upon by the right hand end portion 1) of said outer valve. If thejoints formed by the surfaces a a were not steam-tight, the live steam,as soon as one end portion 1) of the outer valve passed onto the port Bor B, would pass backward over the inner valve, and would act withexactly equal pressure on both ends of the inner valve, and in such casethe inner the outer valve down I may connect the two valves by arod, S,which passes loosely through holes sin the inn er valve, E, and preventseither valve from rising independently of the other.

I do not claim, broadly, as of my invention an outer valve operated byordinary connections and an inner valve which is moved by the outervalve during the latter part of each of its movements, lost motion beingprovided between the valves. I only claim such a combination when theinner valve has projecting 4o portions at its ends on which the outervalve has steam-tight bearings for the purpose before described.

NVhat I claim as my invention, and desire to secure by Letters Patent,is

1. The combination, with an ordinary valveseat, A, provided with theinduction and eduction ports B B, and an exhaust-port, O, of an outervalve, D, for controlling the passage of the motive agent to .theinduction-ports, connections for operating said valve, and an innervalve, E, contained within the outer valve, for controlling the exhaustof the motive agent, and adapted to be operated by said outer valve,sufficient play or lost motion being allowed between the two valves toenable the outer valve to make the first portion of each movementwithout operating the inner valve, and said in ner valve having at itsends projecting p ortions, on the upper surfaces, a, of which thesurfaces a of said outer valve have steam-tight'bearings, substantiallyas herein described.

2. The combination of the valve-seat A, containing the ports B B O, theouter valve, D, and the inner valve, E, having play orlost motionbetween them, and the rod S, passing through both valves, substantiallyas and for the purpose described.

BENJAMIN CARLEY.

itnessesz.

THOMAS W. RANDALL, Jr., CHAS. HOLLAND, Jr.

